Defog is an AI-powered data analysis tool that allows users to ask questions in plain English and receive answers from their own datasets. It can be integrated into applications, providing users with the ability to query data without the need for complex reports or ad hoc analysis. With features like automated foreign key ingestion, custom glossary definitions, and adaptive learning, Defog aims to make data analysis more accessible and efficient. It offers different pricing plans to cater to individual users, fast-growing companies, and large enterprises.